采用荧光光谱法和紫外可见吸收光谱法系统的研究了水溶性ZnO量子点(QDS)的光学性能及其与不同的生物大小分子的作用.研究发现,QDS除了具有普通量子点所具有的优点外,它还具有两个窄的荧光特征发射峰(分别在353和517 nm),并与牛血清白蛋白(BSA)、L-苯丙氨酸(L-Phe)、DL-色氨酸(DL-Try)、L-组氨酸(L-His)等生物分子之间均能形成配合物.荧光光谱显示,L-His对QDS在517 nm处的荧光有猝灭作用;而BSA则对QDS在353 nm处的荧光具有显著的荧光增敏作用,并使QDS的发射峰发生红移(从353 illn移至359 nm).QDS对L-Phe,DL-Try及BSA的荧光产生不同程度的猝灭作用,并且使DL-Try的荧光特征发射峰发生红移(从350 nm移至359 nm),而使BSA的荧光特征发射峰发生紫移(从336nm移至326 nm).其中,QDS对BSA分子的猝灭机制为静态猝灭.应用生物大小分子与QDS作用后的紫外可见吸收光谱,进一步证实了它们与量子点的结合.QDS与生物大小分子的作用表明,QDS可以对这几种生物分子进行跟踪标记,它通过和组成BSA的L-Phe,DL-Try,L-His等氨基酸小分子作用而与BSA作用的.
Characteristics of luminescence spectroscopy of water soluble ZnO quantum dots (QDS) and its interaction with biological molecules were investigated by fluorescence spectroscopy and absorptiometry. It is suggested that except for the advantages of common quantum dots, the water soluble ZnO quantum dots had two narrow fluorescence emission peaks(at 353 and 517 nm respectivly) and it could form complexes with bovine serum albumin, L-phenylalanine( L-phe), DL-tryptophan (DL-Try) and L-histidene(L-his), re-spectively. The fluorescence spectroscopy results showed that the fluorescence peak at 517 nm of QDS was quenched by L-his while the fhoresence peak at 353 nm of QDS enhanced and red shifted (from 353 nm to 359 nm) in the presence of BSA. The fluorescence in-tensity of L-phe, DL-try and BSA were quenched in different degrees by gradually added QDS, meanwhile the inherent fluorescence peak of DL-try red-shifted ( from 350 nm to 359 nm) and the inherent fluorescence peak of BSA blue-shifted ( from 336 nm to 326 nm), the quenching mechanism was mainly static quenching for BSA. The UV spectrum of the interaction between biological molecules and QDS further revealed their combination. The interaction between QDS and biological molecules showed that QDS could label these molecules and the QDS interacted with bovine serum albumin by interacting with its compositions of small amino acids, such as L-Phe, DL-Try and L-His.
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